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PP.pm

package List::SomeUtils::PP;

use 5.006;
use strict;
use warnings;

use List::Util qw( max );

our $VERSION = '0.59';

## no critic (BuiltinFunctions::ProhibitComplexMappings)
## no critic (BuiltinFunctions::RequireBlockGrep)
## no critic (BuiltinFunctions::RequireBlockMap)
## no critic (ControlStructures::ProhibitCStyleForLoops)
## no critic (Subroutines::ProhibitManyArgs)

sub any (&@) {
    my $f = shift;
    foreach (@_) {
        return 1 if $f->();
    }
    return 0;
}

sub all (&@) {
    my $f = shift;
    foreach (@_) {
        return 0 unless $f->();
    }
    return 1;
}

sub none (&@) {
    my $f = shift;
    foreach (@_) {
        return 0 if $f->();
    }
    return 1;
}

sub notall (&@) {
    my $f = shift;
    foreach (@_) {
        return 1 unless $f->();
    }
    return 0;
}

sub one (&@) {
    my $f     = shift;
    my $found = 0;
    foreach (@_) {
        $f->() and $found++ and return 0;
    }
    $found;
}

sub any_u (&@) {
    my $f = shift;
    return undef if !@_;
    $f->() and return 1 foreach (@_);
    return 0;
}

sub all_u (&@) {
    my $f = shift;
    return undef if !@_;
    $f->() or return 0 foreach (@_);
    return 1;
}

sub none_u (&@) {
    my $f = shift;
    return undef if !@_;
    $f->() and return 0 foreach (@_);
    return 1;
}

sub notall_u (&@) {
    my $f = shift;
    return undef if !@_;
    $f->() or return 1 foreach (@_);
    return 0;
}

sub one_u (&@) {
    my $f = shift;
    return undef if !@_;
    my $found = 0;
    foreach (@_) {
        $f->() and $found++ and return 0;
    }
    $found;
}

sub true (&@) {
    my $f     = shift;
    my $count = 0;
    $f->() and ++$count foreach (@_);
    return $count;
}

sub false (&@) {
    my $f     = shift;
    my $count = 0;
    $f->() or ++$count foreach (@_);
    return $count;
}

sub firstidx (&@) {
    my $f = shift;
    foreach my $i ( 0 .. $#_ ) {
        local *_ = \$_[$i];
        return $i if $f->();
    }
    return -1;
}

sub firstval (&@) {
    my $test = shift;
    foreach (@_) {
        return $_ if $test->();
    }
    return undef;
}

sub firstres (&@) {
    my $test = shift;
    foreach (@_) {
        my $testval = $test->();
        $testval and return $testval;
    }
    return undef;
}

sub onlyidx (&@) {
    my $f = shift;
    my $found;
    foreach my $i ( 0 .. $#_ ) {
        local *_ = \$_[$i];
        $f->() or next;
        defined $found and return -1;
        $found = $i;
    }
    return defined $found ? $found : -1;
}

sub onlyval (&@) {
    my $test   = shift;
    my $result = undef;
    my $found  = 0;
    foreach (@_) {
        $test->() or next;
        $result = $_;
        $found++ and return undef;
    }
    return $result;
}

sub onlyres (&@) {
    my $test   = shift;
    my $result = undef;
    my $found  = 0;
    foreach (@_) {
        my $rv = $test->() or next;
        $result = $rv;
        $found++ and return undef;
    }
    return $found ? $result : undef;
}

sub lastidx (&@) {
    my $f = shift;
    foreach my $i ( reverse 0 .. $#_ ) {
        local *_ = \$_[$i];
        return $i if $f->();
    }
    return -1;
}

sub lastval (&@) {
    my $test = shift;
    my $ix;
    for ( $ix = $#_; $ix >= 0; $ix-- ) {
        local *_ = \$_[$ix];
        my $testval = $test->();

# Simulate $_ as alias
        $_[$ix] = $_;
        return $_ if $testval;
    }
    return undef;
}

sub lastres (&@) {
    my $test = shift;
    my $ix;
    for ( $ix = $#_; $ix >= 0; $ix-- ) {
        local *_ = \$_[$ix];
        my $testval = $test->();

# Simulate $_ as alias
        $_[$ix] = $_;
        return $testval if $testval;
    }
    return undef;
}

sub insert_after (&$\@) {
    my ( $f, $val, $list ) = @_;
    my $c = &firstidx( $f, @$list );
    @$list = ( @{$list}[ 0 .. $c ], $val, @{$list}[ $c + 1 .. $#$list ], )
        and return 1
        if $c != -1;
    return 0;
}

sub insert_after_string ($$\@) {
    my ( $string, $val, $list ) = @_;
    my $c = firstidx { defined $_ and $string eq $_ } @$list;
    @$list = ( @{$list}[ 0 .. $c ], $val, @{$list}[ $c + 1 .. $#$list ], )
        and return 1
        if $c != -1;
    return 0;
}

sub apply (&@) {
    my $action = shift;
    &$action foreach my @values = @_;
    wantarray ? @values : $values[-1];
}

sub after (&@) {
    my $test = shift;
    my $started;
    my $lag;
    grep $started ||= do {
        my $x = $lag;
        $lag = $test->();
        $x;
    }, @_;
}

sub after_incl (&@) {
    my $test = shift;
    my $started;
    grep $started ||= $test->(), @_;
}

sub before (&@) {
    my $test = shift;
    my $more = 1;
    grep $more &&= !$test->(), @_;
}

sub before_incl (&@) {
    my $test = shift;
    my $more = 1;
    my $lag  = 1;
    grep $more &&= do {
        my $x = $lag;
        $lag = !$test->();
        $x;
    }, @_;
}

sub indexes (&@) {
    my $test = shift;
    grep {
        local *_ = \$_[$_];
        $test->()
    } 0 .. $#_;
}

sub pairwise (&\@\@) {
    my $op = shift;

# Symbols for caller's input arrays
    use vars qw{ @A @B };
    local ( *A, *B ) = @_;

# Localise $a, $b
    my ( $caller_a, $caller_b ) = do {
        my $pkg = caller();
        ## no critic (TestingAndDebugging::ProhibitNoStrict)
        no strict 'refs';
        ## no critic (ValuesAndExpressions::ProhibitCommaSeparatedStatements)
        \*{ $pkg . '::a' }, \*{ $pkg . '::b' };
    };

# Loop iteration limit
    my $limit = $#A > $#B ? $#A : $#B;

## no critic (Variables::RequireInitializationForLocalVars)
    # This map expression is also the return value
    local ( *$caller_a, *$caller_b );
    map {
        # Assign to $a, $b as refs to caller's array elements
        ( *$caller_a, *$caller_b ) = \( $A[$_], $B[$_] );

# Perform the transformation
        $op->();
    } 0 .. $limit;
}

sub each_array (\@;\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@) {
    return each_arrayref(@_);
}

sub each_arrayref {
    my @list  = @_;    # The list of references to the arrays
    my $index = 0;     # Which one the caller will get next
    my $max   = 0;     # Number of elements in longest array

# Get the length of the longest input array
    foreach (@list) {
        unless ( ref $_ eq 'ARRAY' ) {
            require Carp;
            Carp::croak(
                "each_arrayref: argument is not an array reference\n");
        }
        $max = @$_ if @$_ > $max;
    }

# Return the iterator as a closure wrt the above variables.
    return sub {
        if (@_) {
            my $method = shift;
            unless ( $method eq 'index' ) {
                require Carp;
                Carp::croak(
                    "each_array: unknown argument '$method' passed to iterator."
                );
            }

# Return current (last fetched) index
            return undef if $index == 0 || $index > $max;
            return $index - 1;
        }

# No more elements to return
        return if $index >= $max;
        my $i = $index++;

# Return ith elements
        return map $_->[$i], @list;
    }
}

sub natatime ($@) {
    my $n    = shift;
    my @list = @_;
    return sub {
        return splice @list, 0, $n;
    }
}

sub mesh (\@\@;\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@) {
    my $max = -1;
    $max < $#$_ && ( $max = $#$_ ) foreach @_;
    map {
        my $ix = $_;
        map $_->[$ix], @_;
    } 0 .. $max;
}

sub uniq (@) {
    my %seen = ();
    my $k;
    my $seen_undef;
    grep { defined $_ ? not $seen{ $k = $_ }++ : not $seen_undef++ } @_;
}

sub singleton (@) {
    my %seen = ();
    my $k;
    my $seen_undef;
    grep { 1 == ( defined $_ ? $seen{ $k = $_ } : $seen_undef ) }
        grep { defined $_ ? not $seen{ $k = $_ }++ : not $seen_undef++ } @_;
}

sub minmax (@) {
    return unless @_;
    my $min = my $max = $_[0];

for ( my $i = 1; $i < @_; $i += 2 ) {
        if ( $_[ $i - 1 ] <= $_[$i] ) {
            $min = $_[ $i - 1 ] if $min > $_[ $i - 1 ];
            $max = $_[$i]       if $max < $_[$i];
        }
        else {
            $min = $_[$i]       if $min > $_[$i];
            $max = $_[ $i - 1 ] if $max < $_[ $i - 1 ];
        }
    }

if ( @_ & 1 ) {
        my $i = $#_;
        if ( $_[ $i - 1 ] <= $_[$i] ) {
            $min = $_[ $i - 1 ] if $min > $_[ $i - 1 ];
            $max = $_[$i]       if $max < $_[$i];
        }
        else {
            $min = $_[$i]       if $min > $_[$i];
            $max = $_[ $i - 1 ] if $max < $_[ $i - 1 ];
        }
    }

return ( $min, $max );
}

sub part (&@) {
    my ( $code, @list ) = @_;
    my @parts;
    push @{ $parts[ $code->($_) ] }, $_ foreach @list;
    return @parts;
}

sub bsearch(&@) {
    my $code = shift;

my $rc;
    my $i = 0;
    my $j = @_;
    do {
        my $k = int( ( $i + $j ) / 2 );

$k >= @_ and return;

local *_ = \$_[$k];
        $rc = $code->();

$rc == 0
            and return wantarray ? $_ : 1;

if ( $rc < 0 ) {
            $i = $k + 1;
        }
        else {
            $j = $k - 1;
        }
    } until $i > $j;

return;
}

sub bsearchidx(&@) {
    my $code = shift;

my $rc;
    my $i = 0;
    my $j = @_;
    do {
        my $k = int( ( $i + $j ) / 2 );

$k >= @_ and return -1;

local *_ = \$_[$k];
        $rc = $code->();

$rc == 0 and return $k;

if ( $rc < 0 ) {
            $i = $k + 1;
        }
        else {
            $j = $k - 1;
        }
    } until $i > $j;

return -1;
}

sub sort_by(&@) {
    my ( $code, @list ) = @_;
    return map { $_->[0] }
        sort   { $a->[1] cmp $b->[1] }
        map    { [ $_, scalar( $code->() ) ] } @list;
}

sub nsort_by(&@) {
    my ( $code, @list ) = @_;
    return map { $_->[0] }
        sort   { $a->[1] <=> $b->[1] }
        map    { [ $_, scalar( $code->() ) ] } @list;
}

sub mode (@) {
    my %v;
    $v{$_}++ for @_;
    my $max = max( values %v );
    return grep { $v{$_} == $max } keys %v;
}

# ABSTRACT: Pure Perl implementation for List::SomeUtils

__END__

=pod

=encoding UTF-8

=head1 NAME

List::SomeUtils::PP - Pure Perl implementation for List::SomeUtils

=head1 VERSION

version 0.59

=head1 DESCRIPTION

There are no user-facing parts here. See L<List::SomeUtils> for API details.

=head1 HISTORICAL COPYRIGHT

=head1 SUPPORT

Bugs may be submitted at L<https://github.com/houseabsolute/List-SomeUtils/issues>.

=head1 SOURCE

The source code repository for List-SomeUtils can be found at L<https://github.com/houseabsolute/List-SomeUtils>.

=head1 AUTHORS

=over 4

=item *

Tassilo von Parseval <tassilo.von.parseval@rwth-aachen.de>

=item *

Adam Kennedy <adamk@cpan.org>

=item *

Jens Rehsack <rehsack@cpan.org>

=item *

Dave Rolsky <autarch@urth.org>

=back

=head1 COPYRIGHT AND LICENSE

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

The full text of the license can be found in the
F<LICENSE> file included with this distribution.

=cut

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